Remove Sum Tree codebase

CHANGELOG.md

@@ -7,6 +7,10 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 
 ## [Unreleased]
 
+### Breaking
+
+- [#726](https://github.com/FuelLabs/fuel-vm/pull/726): Removed code related to Binary Merkle Sum Trees (BMSTs). The BMST is deprecated and not used in production environments. 
+
 ## [Version 0.49.0]
 
 ### Added

fuel-merkle/src/lib.rs

@@ -10,7 +10,6 @@ pub mod binary;
 pub mod common;
 pub mod sparse;
 pub mod storage;
-pub mod sum;
 
 #[cfg(test)]
 mod tests;